Moriyama, Y., S. Takaya, T. Nishijima, H. L. Sobel, and N. Ohmagari. “Maintaining Health-System Functionality in Response to the Surge of COVID-19 Cases Due to the Omicron Variant, Japan”. Western Pacific Surveillance and Response, vol. 14, no. 5, Feb. 2024, p. 6, doi:10.5365/wpsar.2023.14.5.1048.